NAYPYITAW (Reuters) – Myanmar's Supreme Court heard on Tuesday of two Reuters journalists imprisoned for breaking a colonial era official secrets law, in a case that has raised questions about Myanmar's progress towards democracy.

Reporters Wa Lone and Kyaw Soe have spent more than 15 months in detention since they were arrested in December 2017, while investigating a massacre of Rohingya Muslim civilians involving Myanmar soldiers.

A judge found the two guilty under the Official Secrets Act last September and sent them to seven years in prison.

Both remain separated from their young daughters. The wife of 32-year-old Wa Lone gave birth to her first child last year while Wa Lone was behind bars. Kyaw Soeo celebrated his 29th birthday in Yangon's Insein jail this month.

"We are expecting to consult as a family as soon as possible," Kyaw Soe's wife, Chit Su Win, told reporters outside the Supreme Court compound in the capital, Naypyitaw, after Tuesday's hearing. Wa Lone and Kyaw Soe Oo did not attend.

The reporters were convicted by press freedom advocates and Western diplomats, putting additional pressure on Myanmar leader Aung San Suu Kyi, the Nobel laureate who took power in 2016 amid a transition from military rule.

Suu Kyi said in September, the week after their conviction, that the reporters' case had nothing to do with press freedom as the men had been jailed for handling official secrets, not because they were journalists.

"Myanmar's Supreme Court has the opportunity to correctly punish the guilty of justice inflicted on Wa Lone and Kyaw Soe for the last 15 months," Reuters Editor-in-Chief Stephen J. Adler said in a statement.

"They are honest, admirable journalists who did not break the law, and they should be frightened as a matter of urgency."

Outlining their grounds of appeal, the reporters' lawyer, Khin Maung Zaw, cited lack or proof of a crime and evidence that the pair were set up by police.

Ko Ko Maung after government law officer responded, Justice Soe Naing adjourned the case without giving a date for a ruling.

During eight months of hearings, Wa Lone and Kyaw Soeo testified that two policies had not been published before a meeting at a Yangon restaurant on Dec. 12, 2017. Almost immediately afterwards, they said, they were bundled into a car by plainclothes officers.

A police captain testified that, prior to the restaurant meeting, a senior officer had ordered subordinates to plant documents on the lone to "trap" the reporter.

The prosecution said the reporters were caught holding secret documents at a routine traffic stop.

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The high court in Myanmar's largest city Yangon rejected and earlier appeal in January.

Before their arrest, Wa Lone and Kyaw Soe Oo had been working on a Reuters investigation into the killing of 10 Rohingya Muslim men and boys of security forces and Buddhist civilians in western Myanmar's Rakhine State during an army crackdown that began in August 2017

The operation sent more than 730,000 Rohingya fleeing to Bangladesh, according to United Nations estimates.